Question

我创建了一个inlineformset_factory，如下所示：

formset = inlineformset_factory(Author, Book, form=BookForm,
                                formset=BaseBookFormSet,
                                can_order=False, can_delete=True,
                                extra=1, fields=('id', name)
                                )

BookForm如下：

class BookForm(forms.ModelForm):
    name = forms.Charfield(required=True)

    def __init__(self, *args, **kwargs):
        super(BookForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.form_tag = False
        self.helper.layout = Layout(
            Div(
                Field("id", type="hidden"),
                Field("name"),
                Field("DELETE")
                )
    )

    class Meta:
        model = Book
        fields = ('id', 'name')

    def clean_name(self):
        book_name = self.cleaned_data['name']
        try:
            book = Book.objects.get(name=book_name)
            return book
         except:
            return book_name

    def clean(self):
        cleaned_data = super(BookForm, self).clean()
        ... other operations on cleaned_data ...

    def has_changed(self):
        changed = super(BookForm, self).has_changed()
        cleaned_data = self.clean()
        ... other code here ...

这在提交表单时出错：

Exception Type: AttributeError
Exception Value: 'BookForm' object has no attribute 'cleaned_data'

在views.py中调用formset.is_valid（）时。 Traceback首先显示has_changed中调用self.clean的行，然后调用clean（）中调用super clean的行。

这曾经在django 1.10中正常工作。

当我在Django 1.10中尝试打印dir（self）时，它会显示＆＃39; cleaning_data＆＃39;作为Django 1.11中的属性之一，它没有。

清洁_数据＆＃39;在哪里？在Django 1.11中消失了吗？

编辑：添加追溯：

Traceback (most recent call last):
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "/vagrant/test_os/inventory/views.py", line 297, in post
    if formset.is_valid():
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/forms/formsets.py", line 321, in is_valid
    self.errors
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/forms/formsets.py", line 295, in errors
    self.full_clean()
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/forms/formsets.py", line 345, in full_clean
    if not form.has_changed():
  File "/vagrant/test_os/inventory/forms.py", line 220, in has_changed
    cleaned_data = self.clean()
  File "/vagrant/test_os/inventory/forms.py", line 177, in clean
    cleaned_data = super(BookForm, self).clean()
  File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/forms/models.py", line 344, in clean
    return self.cleaned_data
AttributeError: 'BookForm' object has no attribute 'cleaned_data'

Answer 1

在验证最小数量的表单时，在1.11（in #26844）中修复了表单集以忽略空表单。作为副作用，formsets现在在验证表单之前在每个表单上调用form.has_changed()。 Django希望form.has_changed()在表单验证之前可以安全地调用，并且默认实现确实可以安全地调用。

您已覆盖form.has_changed()来调用self.clean()，现在会在验证表单之前发生。由于form.clean()要求验证表单，因此失败。

由于form.full_clean()实际上会调用self.has_changed()，因此您无法在form.has_changed()内简单地验证表单。您不会在has_changed()中显示您的操作，但将此代码放在其他位置最有可能是个好主意。

在Django 1.11中哪里有cleaning_data消失了？

1 个答案: